I think the double disks are nice, but not necessary. Lot of bucks that I would put into progressive fork springs and upgraded shocks first. YMMV. The America/Speedy platform is very stable, but softly sprung when really pushing it in switch backs etc. Try her for a few rides as you get her broken in and decide then in MHO.
A great supplier (several support site) is linked
here
Pads and floating rotor adds good upgrade w/o adding another disk.
Good luck.
BobW
